Chevrolet: Chevy 2000, dash area, persistent noise

Question
I own a 2000 - 4 door VLX Cavalier which I bought in '03. The problem is about the brake system. It has been changed since last week. Although the brakes are now working properly, there still this persistent noise as I step on the brake pedal. The noise resembles that of when someone is inflating a baloon or a ball using a manual pump.
The second question is about the driver seat door. Remote couldn't open or lock it anymore, unless I do it manually using the key (from outside).
Appreciate if you can provide some answers...

Thanks


Answer
juliana;
      Well I wonder if you are hearing the noise from the brakes vacume , if it is comming fron up and under the dash area. I would say if the brakes are working good for you than that noise just might be the air / power assist unit.---- and with the door lock -it might just be broken , or if the door can be taken apart to see what is wrong with it.